Liquid-screening apparatus



July 13 1926. 7 1,592,708

G. R. RODDY LIQUID SCREENING APPARATUS Original Filed 00+... 19, 1921 2 Sheets-Sheet 1 July 13 1926.

G. R. RODDY LIQUID SCREENING APPARATUS 2 Sheets-Sheet 2 YIIIIIIIIIIIIlI/IIi/Ilil Original Filed Oct. 19, 1921 4 l'iIIA'II/I/a 'Ilfi arm,

Patented July 13, 1926.

means UNITED STATES P ATENT QFFICE.

GUSTAV R. RODIDY, OF MILAWAUKEE, VIISCONSIN, ASSIGNOR TO CHAIN BELT COMPANY OF MILEVAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

LIQUID-SCREEKING APPARATUS.

Application filed October 19, 1921, Serial No. $8,846. RencwedMay 22, 1926.

My invention relates to sectional traveling screens such as are employed in the treatment of sewage or the waters taken from streams to be used for industrial pur- 5 poses, and has for its object to improve such apparatus as will be hereinafter pointed out.

In the accon'ipanying drawings Figure 1 is a plan view of a section of water screen embodying my invention, parts being broken away.

Fig. 2 is a longitudinal sectional view taken on the line IIII of Fig. 1.

Fig. 3 is a longitudinal sectional view 5 taken on the line III III of Fig. 1.

Fig. 4 is a perspective view illustrating two links of one of the chains and a'portion of one of the screen plates.

The screen herein illustrated consists of 9 a series of perforated metal plates 2 supported at their longitudinal or side edges by chains 3, 3.

In practice the chains 3 are endless, being in fact sprocket conveyor chains, carrying the screen plates 2. As the supporting and drivin mechanism for the chains forms no part oi? the present invention it is not shown in the drawings.

Each chain 3is made up of a series of connected articulated links, each having an outer side bar at and an inner side bar 5. The inner side bar is wider than the outer one, that is, it has greater vertical dimensions, considering the chain as arranged horizontally. These inner side bars of the links are sometimes termed attachment side bars because it is to them, rather than to the outer side bars 4, that the screen plates are secured, either mediately or immediately.

6, 6 indicate cross bars connected with and uniting the inner side bars of corresponding links in the two chains and operating to preventthe screen plates from sag ging at their transverse central portions, and also to stiffen and give strength to the conveying elements of the screen. They are preferably of considerable depth to give the necessary rigidity to the structure. There are preferably a pair of these cross bars at each end of each link, and they are spaced apart by the pieces 7. The cross bars are connected, at their ends, with the inner side bars by angle pieces 8. The upper edges of the inner side bars and of the cross bars are 1n the same plane so as to afford lirm all-round supports for the screen plates. These are secured in place bybolts 9, which preferably pass between the cross bars 6, as represented in Fig. 3.

The screen as thus far described is similar, except for minor details, to that shown and claimed in the pending application for l atent No. 284,926 filed March 25, 1919, byGeorge B. Velser, J12, which application has matured into Patent 1,435,770 dated Noven'lber 14c, 1922. In operating with such a screen it is found that the load of the chains the screen plates 3 and the material which they collectis ont evenly divided between the side bars of the chains, but is borne principally by the inner side bars 5, since the screen plates are connected directly therewith. This causes unequal wear at the joints of the chain and the rollers 10 with which the chains are provided wear more rapidly at one side than the other, so that the life of the chain is reduced. In the screen shown in the aforesaid Velser application for patent the expedient resorted to to prevent this unequal wear of the roll: ers 10 was by uniting the two side bars of each link by rivets. ably to the expense of the chain and was not in all respects satisfactory. I have therefore devised the following means for uniting the links of the chain, and for connecting together the opposite chains at their joints, which overcomes the diliiculties and objections just suggested, due to the screen plates being directly supported by the inner side bars of the chain links only.

11 indicates a through rod the opposite end portions of which serve as the connecting pins for uniting the links of the two chains 3, 3. The intermediate portions of each rod are bent, at 12, 12, in order that the rod may pass below the cross bar 6, thus permitting the latter to have sufficient depth to give them the desired strength. The through-rods 11 connect together the opposite chains and hold them in proper relationship to each other. and at the same time they prevent-the chains from twisting, due to the load being unequally divided between the side bars, with the result that the joints of the chains and the rollers 10 wear with great uniformity. These through rods may be straight but this would mean either mov- .ing over the cross bars 6 so the through This added considerrods might lie between them, which would reduce the effective screening area, or else the height of the side bars 5 of the chains would have to be increased sutliciently to permit the supporting cross bars 6 to be entirely above the through rods, and this would be undesirable, and therefore the bent rod is the preferred form of construction.

However the through rods may be constructed and arranged it is essential that they be entirely below the screen plates 12 and the transverse bars, angles or other parts that support them.

What I claim is:

In a water screening apparatus, the combination of a pair of parallel supporting and conveying chains the links of which have outer and inner side bars, screen plates supported at their side edges by the inner side bars of the opposite chain links, deep, narrow transverse cross bars which serve to support the screen plates at their front and rear edges, and through rods uniting the opposite chains, the rods being bent near their ends so as to pass below the deep transverse cross bars, and the ends of the rods serving as the connecting pins that unite the links of the chains.

GUSTAV R. RODDY. 

